Foot-stock for grinding-machines.



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(Application filed Sept. 9, 1899.)

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ABRAHAM n. mums, or whrnnssonoudn, rnnnsrm'n'mnf FOOT STUCK IFOR GRI-NDlN-G hiiACHlNiES.

SPECIFICATION forming part of Letters Patent No. 644,929, dated March 6, 1900 i Application filed September 9, 1899. Serial No. 729,939. (No model.)

Tort 1073mm it may (lo/worn:

Be it known that I, ABRAHAM B. LANDIS,

va citizen of. the United States, residing at Waynesborough, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Foot- Stocks for Grindingtlachines, of which the following isa specification.

In grinding small cylindrical articles-such as shafts, spindles, the-sin ordinary grindin g-machines the heat generated by the grindingsometimes will expand such work until it will buckle or curve slightly, and thus interfere with the operation and prevent satisfactory results.

' The object of my said invention is to provide a foot-stock for holding one end of such work in which there may be a'slight elasticity to allow for such expansion without the article buckling; and it consists in various improvements in the construction whereby this object is accomplished and in further improvements whereby a Very rigid, durable, and comparatively-ihexpensive foot-stock is provided wherein the spindle is held toperniit of the necessary movements withoutdisturbing its perfect adjustment as at first secured, all as will be hereinafter, more particularly described and claimed.

Referring to the accompanying drawings, which are made a part hereof -andon which similar letters of reference ind icate similar parts, Figure l lis a central longitudinal section through a foot-stock embodying my said improvements; Fig. 2, a cross-seotionthrough the same on the dotted line 2 2 in Fig. 1, and

Fig. 3 a similar vi'ew'of a modified form.

, In said drawings the portionsniarked A represent the spindle bearing; B, the spindle;

0, the center, and D the operatingscrew.

The spindle-bearing Agis formed of a solid block, with one, two, orimore ohannelscut I across the same from thetop down-'to'the'cen- In each of these channels ter of the spindle. a block A, formed to fit closely therein, is

mounted and secured by a screw c. This is preferably done before itis bored, and the blocks are thus bored with the hearing, which blocks may thenbe dressed. off on their under sides to permit them to clamp the spin-" dlewhen drawn downtightly. The rear end .of the petforationis screw-threaded, and a bearing-block a, in which the rear end ofthe operatingscrew ismounted, is fitted therein by means of the screw-threaded connection,

as shown. I

The bearing-blocks A, as before stated, are

secured in their seats in the channels by the screws 01. Around the perforation for said screw, in. the under side of each block, is formed an enlarged seat or cavity, in which a stitt. coiledspring a is mounted; Said I spring serves to keep a tension on said screw and also to force the block off the spindle when the clamping-screw is loosened. Said screw it islocated close to the spindle, and

near the outer endof the block is mounted another screw a in a screw-threaded perform tion, its lower end bearing upon the floor of the channel; Said screw (1' operates to hold the block in its normal position when the spindle is not clamped and free to more in its hearings, and aslight space being left at s when the parts are in such position the turning down of screw 'ct will operate to lift up the end of said block in which it is mounted and force down the opposite end, thusv clamping the spindle and holding it securely.

By this arrangement the normal adjustment 0f the spindle-bearing is not changed after being once adjusted as desired, the slight -movement of the block necessary to clamp the same 'loein'g secured by the operation of screw a without'touching' screw (1'.

In the modified form shown in Fig. 3 the holding-screws are mountedon opposite sides of the spindle. The screw A and the lower part A of :the screw on 'the-opposite side of the spindle correspond in useand operation to the screw a"of the principalconstruction. Said screw A is formed with a a, thereon serves to force down the block to clamp'the s pind-le,;as will be readily'understood. I I

- The spindle. B is inmost respects of a common form, being bored to form a suitable seat for the center 0 at its front end and having a not b for theoperating-screw Dlocated near its lower end. At the rear end of said midway shoulder a, which acts as the head in the nut band at its outer end is nut a shoulder is formed, and the here is enlarged from this point to the end to furnish a suitable way for the travel of the collar 1,

on said screw.

The screw D is mounted at its inner end I journaled in the bearing-block a. A. flanged sleeve D is mounted on the rear end of said screw, with its outer end bearing against the inner face of said block a or a washer d, interposed between them. Said sleeve is exteriorly screwthreaded and has a collar (1 mounted thereon, between which and the collar (1 of screw D is interposed a coiled spring 02 Said sleeve is secured to turn with said screw by means of a spline 61 but is permitted to slidelougitudinally thereon by means of a slot therein,

.with which said spline engages, as shown in Fig. 1. '-The hand-wheel d'ou the'outer end of the screw D serves as the means for operating it, as is usual.

On the outer end of the spindle B acap B is preferably secured by means of screws Z), said cap extending back to engage around the outer end of the hearing A, the two parts being dressed to make a close joint at this point. By this means all grit and dirt are kept out of the joint between the spindle and its bearing, and much destruction from wear ordinarily resulting from this cause is thus avoided.

The center 0 is of a common form, provided with the oil-hole c and mounted in the spindle 13 in a common manner.

In use the spindle is mounted and secured in its bearing by a proper adjustment of the screws a, which hold the blocks A. The spindle 13, carrying the center 0, is adjusted out and in by means of the screw D engaging with the nut b. It is'forced up to the work by turning said screw in the proper direction by means of the hand-wheeld until the spring is compressed to bring the collar (1 back against the end of sleeve D, and it the work to be held is of a heavy variety the center can be forced against it with as much force as desired. If, however, the work is small and such as is liable to be affected by the heat of grinding, after thecollar and end of sleeve come together the screw is then backed half a turn or so to separate the parts and throw the load upon the spring, which holds the work yieldingly and prevents it from buckling if expanded by said heat. hen it is desired to clamp the spindle to hold the same rigidly under a certain tension, the clamping-screws are used, as described.

The tension of the spring can be ad usted said spring or allow it to expandfto increase or lessen its tension, as will be readily understood.

Having thus fully described my said inven-' tion, what I claim as new, and desire to secure by Letters Patent, is-- 1. 'Ihecombination of aholding-center, its

spindle, the means for operating said spindle,

the spindle-bearing, said spindle-bearing consisting of a solid block bored to receive said spindle, and having a transverse channel with a bearing-block mounted therein, formed with a bearing-face which rests upon said spindle,

and means for adjusting and securing said block to hold said spindle, substantially asset forth.

2. The combination of the hearing A having the transverse channel'containing bearing-block A, said block secured therein bya screw, the tension-spring aropnd said screw, the clamping-screw engaging-one side of said block, the spindle, the operating devices, and the center carried by said spindtle, substanti'ally as set forth.

The combination, of aholding-center, its spindle, the bearing for said spindle, a screw journaled in the end of said bearing and engaging a nut in the end of said spindle, a

. sleeve mounted on said screw to turn there' with and slide thereon, a spring interposed between a collar on said sleeve and a collar on said screw, said collar being secured on said screw in front of said sleeve, substantially as described and for the purposes specified.

4:. In a foot-stock, the combination, of the holding-center carried y a spindle which is adjustably mounted in a bearing and adapted to be supported against longitudinal thrust through a yielding or spring connection, substantially as set forth.

5. The combination of a holding center carried by an adjustable spindle, adjusting means therefor, a rigid support for said parts, and a spring in terposcd between said support and parts,whereby by slightlyseparatingsaid parts the load will be thrown onto said spring, substantially as set forthl In witness whereof I have hereunto set my hand and seal, at aynesborough, Pennsylvania, this-31st day of August, A. D. 189.).

ABRAHAM B. LANDIS. [Ls] \Vitnesses H. S. STOUFFE,

D. M. RUssELL. 

